Cerro Armazones at night, Chile
Cerro Armazones at night, Chile. This location is the construction site for Extremely Large Telescope (ELT). When completed (estimated 2027) the ELT will have a 39-metre primary mirror which will make it the world's largest optical telescope. Visible in the night sky is the Milky Way galaxy., by ESO/PETR HORALEK/SCIENCE PHOTO LIBRARY
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